import { apiFetch } from "./api.js";
import { dom } from "./dom.js";
import { loadPoints, updatePointFilterSummary } from "./points.js";
import { state } from "./state.js";

function renderPointSourceOptions() {
  if (!dom.pointSourceSelect) {
    return;
  }

  const options = ['<option value="">选择数据源</option>'];
  state.sources.forEach((source) => {
    const selected = source.id === state.selectedSourceId ? "selected" : "";
    options.push(`<option value="${source.id}" ${selected}>${source.name}</option>`);
  });
  dom.pointSourceSelect.innerHTML = options.join("");
}

export function renderSources() {
  dom.sourceList.innerHTML = "";

  state.sources.forEach((source) => {
    const card = document.createElement("div");
    card.className = `list-item source-card ${state.selectedSourceId === source.id ? "selected" : ""}`;
    card.innerHTML = `
      <div class="row">
        <strong>${source.name}</strong>
        <span class="badge ${source.is_connected ? "" : "offline"}">${source.is_connected ? "ONLINE" : "OFFLINE"}</span>
      </div>
      <div class="muted">${source.endpoint}</div>
      <div class="row source-card-actions"></div>
    `;

    card.addEventListener("click", () => {
      selectSource(source.id).catch((error) => {
        dom.statusText.textContent = error.message;
      });
    });

    const actionRow = card.querySelector(".source-card-actions");

    const editBtn = document.createElement("button");
    editBtn.className = "secondary";
    editBtn.textContent = "编辑";
    editBtn.addEventListener("click", (event) => {
      event.stopPropagation();
      dom.sourceId.value = source.id;
      dom.sourceName.value = source.name || "";
      dom.sourceEndpoint.value = source.endpoint || "";
      dom.sourceEnabled.checked = !!source.enabled;
      dom.sourceModal.classList.remove("hidden");
    });

    const reconnectBtn = document.createElement("button");
    reconnectBtn.className = "secondary";
    reconnectBtn.textContent = "重连";
    reconnectBtn.addEventListener("click", (event) => {
      event.stopPropagation();
      reconnectSource(source.id, source.name).catch((error) => {
        dom.statusText.textContent = error.message;
      });
    });

    const deleteBtn = document.createElement("button");
    deleteBtn.className = "danger";
    deleteBtn.textContent = "删除";
    deleteBtn.addEventListener("click", (event) => {
      event.stopPropagation();
      deleteSource(source.id).catch((error) => {
        dom.statusText.textContent = error.message;
      });
    });

    actionRow.append(editBtn, reconnectBtn, deleteBtn);
    card.appendChild(actionRow);
    dom.sourceList.appendChild(card);
  });

  renderPointSourceOptions();
}

export async function loadSources() {
  state.sources = await apiFetch("/api/source");
  if (state.selectedSourceId && !state.sources.some((item) => item.id === state.selectedSourceId)) {
    state.selectedSourceId = null;
  }
  renderSources();
  updatePointFilterSummary();
}

export async function selectSource(sourceId) {
  state.selectedSourceId = state.selectedSourceId === sourceId ? null : sourceId;
  state.selectedNodeIds.clear();
  state.pointsPage = 1;
  renderSources();
  updatePointFilterSummary();
  await loadPoints();
}

export async function saveSource(event) {
  event.preventDefault();

  const payload = {
    name: dom.sourceName.value.trim(),
    endpoint: dom.sourceEndpoint.value.trim(),
    enabled: dom.sourceEnabled.checked,
  };

  const id = dom.sourceId.value;
  await apiFetch(id ? `/api/source/${id}` : "/api/source", {
    method: id ? "PUT" : "POST",
    body: JSON.stringify(payload),
  });

  dom.sourceModal.classList.add("hidden");
  dom.sourceForm.reset();
  await loadSources();
}

export async function reconnectSource(sourceId, name) {
  dom.statusText.textContent = `正在重连 ${name || "数据源"}...`;
  await apiFetch(`/api/source/${sourceId}/reconnect`, { method: "POST" });
  await loadSources();
  dom.statusText.textContent = "就绪";
}

export async function deleteSource(sourceId) {
  if (!window.confirm("确认删除该数据源？")) {
    return;
  }

  await apiFetch(`/api/source/${sourceId}`, { method: "DELETE" });
  if (state.selectedSourceId === sourceId) {
    state.selectedSourceId = null;
  }
  await loadSources();
  await loadPoints();
}